Re: bug in write(2) system call.
Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 20 Oct 1998 14:02:52 +0100 (BST)
> > pointer an exception will be raised and the kernel just has to handle it
> > appropriately.
>
> And what if the user program passes a pointer that is valid for the
> kernel to dereference (hence the MMU triggers no exception), but is not
> something userland code should be able to touch?
Thats what the access_ok() part of the intel copy_from_user macro tests.
Since user and kernel space are disparate addresses the check is easy
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